LTC4217IDHC

LTC4217IDHC is a dual hot‑swap controller from Analog Devices (Linear Technology heritage). It drives two external N‑channel MOSFETs to protect and power two loads from a common supply, enabling safe plug‑in and hot‑swap operation.
Key points:
- Two independent channels: each controls a MOSFET to provide inrush limiting and protection.
- Programmable current limit via sense resistor, with fast overcurrent protection.
- Soft‑start to limit inrush when a board is plugged in.
- Fault/status reporting (flags) and configurable latch behavior for monitoring.
- Typically used for hot‑swap protection in servers, telecom, PCI/PCIe cards, and industrial power rails.
Packaging/temperature:
- IDHC denotes the specific package variant and industrial temperature/lead‑free status.
In short, LTC4217IDHC provides dual, programmable current‑limit hot‑swap control with soft‑start and fault signaling, for protecting two loads on a single supply.

Direct drop-in equivalents for LTC4217IDHC aren’t exact pin-for-pin replacements. Closest functionally equivalent parts from other vendors include:
- Analog Devices: ADP4217 (hot-swap controller with current limit)
- Texas Instruments: TPS2430 / TPS2386 family (hot-swap controllers)
- On Semiconductor: NCP4217 (hot-swap/current-limit controller)
Verify voltage/current specs, package, and control signals before substituting.

Here are the main features of the LTC4217IDHC (dual hot‑swap/power-path protector):
- Dual hot‑swap controller for two rails
- Adjustable current limit via external sense resistor
- Soft‑start to constrain inrush currents
- Overcurrent protection with latch and auto‑retry
- Overvoltage and undervoltage protection
- Thermal shutdown/thermal protection
- Reverse polarity and reverse‑current protection using back‑to‑back MOSFETs
- Independent enable inputs for each channel
- Status/FAULT outputs for monitoring
- Small 8‑pin package with low quiescent current
- Designed for safe hot‑swap and power‑distribution applications

- Pin count: 16 pins (LTC4217IDHC in a 16‑lead package such as TSSOP/SSOP).
- Function: Dual hot‑swap controller with programmable current limit and fault reporting. It drives external N‑channel MOSFETs to limit inrush and protect two positive-supply rails, providing soft‑start, undervoltage/overcurrent protection, and status/fault outputs.

- Manufacturer: Linear Technology Corporation (LTC), an American semiconductor company.
- What kind of company: A designer and manufacturer of analog and mixed-signal integrated circuits. Since 2017, Linear Technology is a subsidiary of Analog Devices, Inc.

- Hot‑swap controller for DC power rails in backplanes (servers, telecom, storage, networking).
- Soft‑start and inrush current limiting for the high‑side MOSFET.
- Overcurrent/short‑circuit protection on the power path.
- Reverse‑current protection and redundant‑supply (ORing) support.
- Fault/status signaling to a host MCU (fault, PGOOD, etc.).
- Suitable for industrial and automotive DC power architectures with wide input ranges.

LTC4217IDHC comes in a 16-pin Plastic TSSOP (thermally enhanced) package.